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More Elaborate work to avoid instantiating unification variables with out-of-scope regular variables
author Adam Chlipala <adam@chlipala.net>
date Sat, 24 Oct 2015 17:23:07 -0400
parents 71bafe66dbe1
children
rev   line source
adamc@20 1 con c1 = int
adamc@20 2 con c2 = (fn t :: Type => t) int
adamc@20 3
adamc@20 4 con id = fn t :: Type => t
adamc@20 5 con c3 = id int
adamc@20 6
adamc@20 7 con fst = fn t1 :: Type => fn t2 :: Type => t1
adamc@20 8 con c4 = fst int string
adamc@20 9
adamc@20 10 con snd = fn t1 :: Type => fn t2 :: Type => t2
adamc@20 11 con c5 = snd int string
adamc@20 12
adamc@20 13 con apply = fn f :: Type -> Type => fn t :: Type => f t
adamc@20 14 con c6 = apply id int
adamc@20 15 con c7 = apply (fst int) string
adamc@20 16
adamc@22 17 val tickle = fn n :: Name => fn t :: Type => fn fs :: {Type} =>
adamc@20 18 fn x : $([n = t] ++ fs) => x
adamc@22 19 val tickleA = tickle[#A][int][[B = string]]
adamc@22 20 val test_tickleA = tickleA {A = 6, B = "13"}
adamc@22 21
adamc@22 22 val grab = fn n :: Name => fn t ::: Type => fn fs ::: {Type} =>
adamc@22 23 fn x : $([n = t] ++ fs) => x.n
adamc@22 24 val test_grab1 = grab[#A] {A = 6, B = "13"}
adamc@22 25 val test_grab2 = grab[#B] {A = 6, B = "13"}
adamc@23 26
adamc@23 27 val main = {A = test_grab1, B = test_grab2}